Reinforcing-bar.



T. W. JENKS.

HEINFORGING BAR.

APPLICATION FILED 112.1901

Patented Nov. 9, 1909.

INVENTOR VZW WITNESSES yyiw/z r. menu, a wan m. mvo-mmmtn M UNITED STATES THOMAS W. JENKS, OF AVALON, PENNSYLVANIA.

REINFORCING-BAR.

Application filed February To all whom it may concern:

Be it known that I, THOMAS W. JENKS, of Avalon, Allegheny county, Pennsylvania, have invented a new and useful Improvement in Reinforcing-Bars, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a perspective view of the bar; and Fig. 2 is a plan view partly in section.

My invention relates to the bars emplo ed in reinforced concrete construction, an is designed to provide an improved form of bar which will increase the strength of the structure and the bond between the concrete and bar.

To that end, it consists in a bar having continuous corner ribs and inclosed face recesses.

In the drawings, I show a preferred form of my improved bar, in which the bar 2 is provided on each face with a series of re cesses or cavities 3, each of which is entirely inclosed on all edges. 1 have shown the re cesses in one face as staggered or alternated with those in the next adjacent face; and this is the preferred form. The complete inclosing of each cavity is secured by the continuously extending edge ribs 4 at each corner and the somewhat closely adjacent transverse ribs extending at right angles to said ribs across the bar, alternately with the correspondingly disposed cavities 3. These transverse ribs are, like the cavities, staggered or alternated throughout the length of the bar for each of the four sides, and a particular feature of advantage and novelty is that they merge into the surface of the corner ribs 4 flush therewith so that the surfaces of the bar at the junction of the trans verse and longitudinal ribs are practically continuous, irrespective of what form the middle portion of the transverse ribs may assume.

The device may be made in any suitable Specification of Letters Patent.

Patented Nov. 9, 1909.

2, 1907. Serial No. 355,416.

manner, but preferably by the method of my prior Letters Patent 882,321 of March 17th, 1908.

The advantages of my invention result from inclosing the cavities on all edges, thus providing a continuous corner rib, and merging the transverse ribs thereinto on the same plane, insuring symmetry, equal resistance to strains, and avoiding any sharp edges or inconvenience in handling. This construction gives greater shearing stren th. It also increases the tensile strength an the elastic limit of the bar. It also greatly increases the life of the rolls, and enables them to be more easily made, and gives better distribution of the metal in rolling, since the excess metal flows into the raised portions in the sides between the recesses.

By the use of the continuous corner rib, the recesses ma be increased in length, thus decreasin the i ength of the raised portions, without decreasing the strength of the bar. I thus obtain a stronger bar without any additional metal being needed.

The shape of the recesses may be varied, as well as the thickness of the inclosing walls, the depth of the recess, the cross-sectional shape of the bar, etc, without departing from my invention.

I claim A reinforcing bar for concrete construction substantially square in cross section, each face of the bar constituting a flat plane surface and being provided with depressions included within the boundaries of such face, said depressions being shallow and bounded within inclined sides substantially square in configuration, the depressions in each face being staggered with relation to the depressions in each adjacent face.

In testimony whereof, I have hereunto set my hand.

THOMAS W. JENKS. W'itnesses JOHN MILLER, H. M. CORWIN. 

